Note 5 - Notes Payable and Debentures - Non-related Parties (Details Textual) | Dec. 15, 2018USD ($) | Nov. 30, 2018USD ($)shares | Nov. 06, 2018USD ($)shares | Oct. 22, 2018USD ($)shares | Oct. 08, 2018USD ($)shares | Sep. 15, 2018USD ($) | Sep. 12, 2018USD ($)shares | Aug. 01, 2018USD ($)shares | Jul. 31, 2018USD ($)shares | Jul. 23, 2018USD ($)shares | Jul. 19, 2018USD ($)shares | Jun. 15, 2018USD ($) | Mar. 01, 2018USD ($)shares | Feb. 24, 2018USD ($) | Dec. 13, 2017USD ($) | Sep. 20, 2017USD ($)shares | Feb. 24, 2016USD ($) | Apr. 30, 2018USD ($)shares | Mar. 31, 2018USD ($)shares | Feb. 28, 2018USD ($) | Jan. 31, 2018USD ($) | Dec. 31, 2017USD ($) | Oct. 31, 2017USD ($) | Dec. 31, 2018USD ($)shares | Mar. 31, 2018USD ($)shares | Mar. 31, 2018USD ($)shares | Dec. 31, 2018USD ($)shares | Dec. 31, 2017USD ($)shares |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | | | | | | | | | | | | $ 437,000 | | $ 1,008,000 | | | $ 1,008,000 | $ 437,000 |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | | | | | | | | | | | | | | | | | | | $ (1,332,000) | $ (700,000) |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | | | | | | | | | 90,644 | 26,905 |
Stock Issued During Period, Value, Restricted Stock Award, Gross | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Interest Expense, Debt, Total | | | | | | | | | | | | | | | | | | | | | | | | | | | 55,000 | 73,000 |
Amortization of Debt Discount (Premium) to Interest Expense | | | | | | | | | | | | | | | | | | | | | | | | | | | 1,400,000 | $ 348,000 |
Third-party Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | | | | | | 8,193 | | | | |
Stock Issued During Period, Value, Restricted Stock Award, Gross | | | | | | | | | | | | | | | | | | | | | | | | $ 88,000 | | | | |
Short Term Loan With Certain Merchant Processors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Short-term Debt, Total | | | | | | | | | | | | | | | | | | | | | | | | 157,000 | | | 157,000 | |
Short-term Loan Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Insurance Premiums Collected | | | | | | | | | | | | | | | | | | | | | | | | | | | 175,000 | |
Debt Instrument, Nine Monthly Installment Payment | | | | | | | | | | | | | | | | | | | | | | | | | | | 16,000 | |
Debt Instrument, Six Monthly Installment Payment | | | | | | | | | | | | | | | | | | | | | | | | | | | 6,000 | |
Short-term Debt, Total | | | | | | | | | | | | | | | | | | | | | | | | $ 108,000 | | | $ 108,000 | |
February 2016 Note Payable [Member] | SBI [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | | $ 550,000 | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | 20.00% | | | | | | | | | | | |
Debt Instrument, Term | | | | | | | | | | | | | | | | | 2 years | | | | | | | | | | | |
Debt Instrument, Periodic Payment, Total | | | | | | | | | | | | | | $ 28,000 | | | | | | | | | | | | | | |
September 2017 Note Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | $ 150,000 | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | 5.00% | | | | | | 5.00% | | 5.00% | | | 5.00% | 5.00% |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | | $ 15,000 | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | $ 165,000 | | | | | | | | | | | | |
Stock Issued During Period, Shares, Debt Instrument Issuance | shares | | | | | | | | | | | | | | | | 8,524 | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | | | | | | $ 70,000 | | | | | | | | | | | | |
September 2017 Note Payable [Member] | Fair Value in Excess of the Settled Principal and Interest Balance [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | | | | | | | | | | $ 27,000 | | | | | | | | | | |
September 2017 Note Payable [Member] | Unamortized Debt Discount [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | | | | | | | | | | $ 12,000 | | | | | | | | | | |
September 2017 Note Payable [Member] | Conversion of Debt to Shares of Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | | | | | | | | | | | | | | | | | 14,041 | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | | | | | | | | | | | | $ 170,000 | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | | | | | | | | | | | | | | | 196,000 | | | | | | | | | | |
October and December 2017 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | | | | | | | $ 500,000 | $ 500,000 | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | | | | | 0.00% | | | | | | 0.00% |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | | | | | | | | $ 200,000 | | | | | | $ 200,000 |
October and December 2017 Notes Payable [Member] | Fair Value in Excess of the Settled Principal and Interest Balance [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | $ 117,000 | | | | $ 218,000 | | | | | | | | | | | | | | | |
October and December 2017 Notes Payable [Member] | Unamortized Debt Discount [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | $ 67,000 | | | | 38,000 | | | | | | | | | | | | | | | |
October and December 2017 Notes Payable [Member] | Conversion of Debt to Shares of Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | | | | | | | | 22,676 | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | | | $ 250,000 | | | | 167,000 | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | | | | | | $ 367,000 | | | | $ 385,000 | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | 21,429 | | | | | | | | | | | | | | | |
October 2017 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Number of Payments | | | | | | | | | | | | | | | | | | | | | | | 9 | | | | | |
Debt Instrument, Periodic Payment, Interest | | | | | | | | | | | | | | | | | | | | | | $ 50,000 | $ 67,000 | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | | | | | | | | | | | | | | | | 27.00% | | | | | |
December 2017 Note Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | $ 350,000 | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | 5.00% | | | | | | | 5.00% | | | | | | 5.00% |
Debt Instrument, Periodic Payment, Total | $ 132,000 | | | | | $ 133,000 | | | | | | $ 140,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | $ 40,000 | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | | | | | | | | | 36,502 | | | | | | | | | | | | | | | | | | |
Debt Instrument, Number of Payments | | | | | | | | | | | | | | | | | | | | | | 12 | | | | | | 12 |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | | | | | | | | | | | | | | | 20.00% | | | | | | 20.00% |
December 2017 Note Payable [Member] | Fair Value in Excess of the Settled Principal and Interest Balance [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | | $ 280,000 | | | | | | | | | | | | | | | | | | |
December 2017 Note Payable [Member] | Unamortized Debt Discount [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | | | | | | 43,000 | | | | | | | | | | | | | | | | | | |
December 2017 Note Payable [Member] | Conversion of Debt to Shares of Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | | | | 402,000 | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | | | | | | | $ 682,000 | | | | | | | | | | | | | | | | | | |
January and March 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | | | | $ 550,000 | | $ 678,000 | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | | 0.00% | | | | | | 0.00% | 0.00% | | |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | | | | | $ 269,000 | | | | | | $ 269,000 | $ 269,000 | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | | | 1,500,000 | | | | | | 1,500,000 | 1,500,000 | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | | | | | | | | | $ 188,000 | | 227,000 | | | | $ 188,000 | $ 188,000 | | |
Debt Instrument, Number of Payments | | | | | | | | | | | | | | | | | | | 12 | | | | | | 12 | 12 | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | | | | | | | | | | | | 22.00% | | | | | | 22.00% | 22.00% | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | | | | | | | | | $ 56,000 | | $ 68,000 | | | | | | | | |
January and March 2018 Notes Payable [Member] | Three Unrelated Third-party Investors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | | | | | | | | 12,210 | | |
January and March 2018 Notes Payable [Member] | Conversion of Debt to Shares of Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | | 11,905 | | | | | | 27,211 | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | $ 100,000 | | | | | | $ 300,000 | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | 133,000 | | | | | | 440,000 | | | | | | | | | | | | | | | | | | | |
January and March 2018 Notes Payable [Member] | Fair Value in Excess of the Settled Principal and Interest Balance [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | 33,000 | | | | | | 140,000 | | | | | | | | | | | | | | | | | | | |
January and March 2018 Notes Payable [Member] | Unamortized Debt Discount [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | $ 24,000 | | | | | | $ 100,000 | | | | | | | | | | | | | | | | | | | |
January 2018 Notes Payable [Member] | Third-party Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Value, Restricted Stock Award, Gross | | | | | | | | | | | | | | | | | | | | | 5,918 | | | | | | | |
March 2018 Notes Payable [Member] | Third-party Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | 2,998 | | | | | | | | | |
Stock Issued During Period, Value, Restricted Stock Award, Gross | | | | | | | | | | | | | | | | | | | $ 55,000 | | $ 68,000 | | | | | | | |
February and March 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | | | | | | | | | | | $ 650,000 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | | 5.00% | | | 5.00% | | | 5.00% | 5.00% | | 5.00% |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | | | | | $ 70,000 | | | | | | $ 70,000 | $ 70,000 | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | | | 720,000 | | | | | | 720,000 | 720,000 | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | | | | | | | | | $ 129,000 | | | | | | $ 129,000 | $ 129,000 | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | | | | | | | 14,143 | | | |
February and March 2018 Notes Payable [Member] | Fair Value in Excess of the Settled Principal and Interest Balance [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | $ (88,000) | | | $ 145,000 | | | | | | | | | | | | | | | | | | | | | | | |
February and March 2018 Notes Payable [Member] | Unamortized Debt Discount [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Gain (Loss) on Extinguishment of Debt, Total | | | | | $ (3,000) | | | | | | | | | | | | | | | | | | | | | | | |
February and March 2018 Notes Payable [Member] | Conversion of Debt to Shares of Common Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | 20,940 | | | 40,481 | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | $ 143,000 | | | $ 340,000 | | | | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | 231,000 | | | $ 485,000 | | | | | | | | | | | | | | | | | | | | | | | |
Second March 2018 Note Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Number of Payments | | | | | | | | | | | | | | | | | | | 3 | | | | | | 3 | 3 | | |
February 2018 Note Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | | | | | | | | | | $ 94,000 | | | | | | | | |
July 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | $ 500,000 | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 5.00% | | | | | | | | | | | 5.00% | | | | | | 5.00% |
Debt Instrument, Original Issue Discount | | | | | | | | | | | $ 50,000 | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | 550,000 | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | | | | $ 226,000 | | | | | | | | | | | | | | | | | |
July 2018 Notes Payable [Member] | Three Unrelated Third-party Investors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | 15,239 | | | | | | | | | | | | | | | | | |
August 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | $ 1,000,000 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | 0.00% | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Original Issue Discount | | | | | | | | $ 200,000 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | | $ 435,000 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Number of Payments | | | | | | | | 12 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | 20.00% | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | $ 100,000 | | | | | | | | | | | | | | | | | | | | |
August 2018 Notes Payable [Member] | Third-party Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | 6,086 | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Value, Restricted Stock Award, Gross | | | | | | | | $ 100,000 | | | | | | | | | | | | | | | | | | | | |
August 2018 Notes Payable [Member] | Investors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | 9,524 | | | | | | | | | | | | | | | | | | | | |
September 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | $ 350,000 | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | 5.00% | | | | | | | | | | | | | | | 5.00% | | | | | | 5.00% |
Debt Instrument, Original Issue Discount | | | | | | | $ 40,000 | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | $ 390,000 | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Number of Payments | | | | | | | 3 | | | | | | | | | | | | | | | | | | | | | |
September 2018 Notes Payable [Member] | Unrelated Third Party Investor [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | $ 500,000 | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | | | | $ 130,000 | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | 9,524 | | | | | | | | | | | | | | | | | | | | | |
October 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 5.00% | | | | | | | | | | | | | | | | | | 5.00% | | | | | | 5.00% |
Debt Instrument, Original Issue Discount | | | | $ 50,000 | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | 550,000 | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | | | $ 176,000 | | | | | | | | | | | | | | | | | | | | | | | | |
October 2018 Notes Payable [Member] | Three Unrelated Third-party Investors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | 15,239 | | | | | | | | | | | | | | | | | | | | | | | | |
November and December 2018 Notes Payable [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | | | | | | | | | | | | | | | | | | | | | $ 1,250,000 | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | | | | | | | 0.00% | | | 0.00% | |
Debt Instrument, Original Issue Discount | | | | | | | | | | | | | | | | | | | | | | | | $ 270,000 | | | $ 270,000 | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | | | | | | | | 1,520,000 | | | 1,520,000 | |
November and December 2018 Notes Payable [Member] | Three Unrelated Third-party Investors [Member] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Unamortized Discount, Total | | $ 374,000 | | | | | | | | | | | | | | | | | | | | | | $ 125,000 | | | $ 125,000 | |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | | | | | | | | | | | | | | | | | | | | | | | | 14,763 | | | | |