Note 4 - Credit Facilities and Other Debt (Details Textual) ¥ in Millions, $ in Millions, $ in Millions | Mar. 22, 2021USD ($) | Jan. 05, 2021USD ($) | Apr. 10, 2019USD ($) | Jan. 09, 2018USD ($) | Mar. 31, 2021USD ($) | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021MXN ($) | Mar. 31, 2021AUD ($) | Mar. 31, 2021CNY (¥) | Mar. 22, 2021CAD ($) | Jan. 05, 2021CAD ($) | Oct. 31, 2017AUD ($) |
Resource Plus Acquisition Note [Member] | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 2,300,000 | | | | | | | | | |
Notes Payable, Total | | | | | $ 1,300,000 | | | | | | | | |
North Mill, LLC [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 6.75% | | | 6.75% | 6.75% | 6.75% | | | |
Fifth Third Bank [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 3.60% | | | 3.60% | 3.60% | 3.60% | | | |
National Australia Bank [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 6.56% | | | 6.56% | 6.56% | 6.56% | | | |
Industrial Bank [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 6.00% | | | 6.00% | 6.00% | 6.00% | | | |
Industrial Bank [Member] | SPAR China [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 6.00% | | | 6.00% | 6.00% | 6.00% | | | |
Debt Instrument, Face Amount | | | | | $ 460,000 | | | | | ¥ 3 | | | |
Long-term Debt, Total | | | | | $ 460,000 | | | | | ¥ 3 | | | |
CCB Bank [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 6.00% | | | 6.00% | 6.00% | 6.00% | | | |
CCB Bank [Member] | SPAR China [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 6.00% | | | 6.00% | 6.00% | 6.00% | | | |
Debt Instrument, Face Amount | | | | | $ 153,000 | | | | | ¥ 1 | | | |
Long-term Debt, Total | | | | | $ 153,000 | | | | | ¥ 1 | | | |
Ve Por Mas [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 7.30% | | | 7.30% | 7.30% | 7.30% | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | | | | | | | | | | | | | |
Debt Instrument, Facility Fee for First 10.5 Million Loan Balance, Percentage | 0.80% | 1.50% | 1.50% | | | | | | | | | | |
Debt Instrument, Fee Amount | $ 84,000 | $ 157,500 | | | | | | | | | | | |
Debt Instrument, One Time Fee for Each Incremental 1 Million Increase in Loan Balance | $ 15,000 | 15,000 | | | | | | | | | | | |
Payments for Debt Instrument Modification Fee | | $ 7,500 | | | | | | | | | | | |
Debt Instrument, Early Termination Fee, Percentage | 1.00% | | 0.85% | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | 6.75% | | | 6.75% | 6.75% | 6.75% | | | |
Line of Credit, Current | | | | | $ 11,800,000 | | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Prime Rate [Member] | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | 0.95% | 1.25% | | | | | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Minimum [Member] | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% | 6.75% | | | | | | | | | 5.25% | 6.75% | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | $ 16,500,000 | | | | | | | | | | | | |
Borrowing Base Availability for Unbilled Receivables, Percentage | 70.00% | | | | | | | | | | | | |
Debt Instrument, Covenant, Unbilled Cap | $ 5,500,000 | | $ 4,500,000 | | | | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | $ 1.5 | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | | | | | | | | | | | | | |
Debt Instrument, Term (Month) | | | 1 year 180 days | | | | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Marketing Force [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | $ 14,500,000 | | | | | | | | | | | |
Debt Instrument, Covenant, Unbilled Cap | | 4,500,000 | | | | | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Marketing Force [Member] | Forecast [Member] | | | | | | | | | | | | | |
Borrowing Base Availability for Unbilled Receivables, Percentage | | | | | | 65.00% | | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Marketing Force [Member] | Forecast [Member] | Maximum [Member] | | | | | | | | | | | | | |
Borrowing Base Availability for Unbilled Receivables, Percentage | | | | | | | 70.00% | | | | | | |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Canada Company [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | $ 1.5 | |
Debt Instrument, Covenant, Unbilled Cap | | $ 3,900,000 | | | | | | | | | | | |
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | $ 3,500,000 | | | | | | | | | |
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability | | | | 80.00% | | | | | | | | | |
Long-term Line of Credit, Total | | | | | $ 0 | | | | | | | | |
Line of Credit Facility, Interest Rate at Period End | | | | | 3.60% | | | 3.60% | 3.60% | 3.60% | | | |
Debt Covenant, Minimum Fixed Charge Ratio | | | | 1.2 | | | | | | | | | |
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 2.50% | | | | | | | | | |
Revolving Credit Facility [Member] | National Australia Bank [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | $ 608,659 | | | | | | | | $ 800,000 |
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability | | | | | | | | | | | | | 80.00% |
Long-term Line of Credit, Total | | | | | 9,188 | | | | $ 12,076 | | | | |
Revolving Credit Facility [Member] | Ve Por Mas [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | 390,096 | | | $ 8 | | | | | |
Long-term Line of Credit, Total | | | | | $ 0 | | | | | | | | |
Line of Credit Facility, Interest Rate at Period End | | | | | 7.30% | | | 7.30% | 7.30% | 7.30% | | | |
Revolving Credit Facility [Member] | Ve Por Mas [Member] | Interbank Interest Rate [Member] | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | 3.00% | | | | | | | | |
Revolving Credit Facility [Member] | BBVA Bancormer [Member] | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | $ 243,810 | | | $ 5 | | | | | |
Long-term Line of Credit, Total | | | | | $ 243,810 | | | $ 5 | | | | | |
Line of Credit Facility, Interest Rate at Period End | | | | | 9.60% | | | 9.60% | 9.60% | 9.60% | | | |
Revolving Credit Facility [Member] | BBVA Bancormer [Member] | Interbank Interest Rate [Member] | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | 5.20% | | | | | | | | |