Note 9 - Debt (Details Textual) $ in Thousands | Apr. 02, 2018USD ($) | Mar. 31, 2018USD ($) | Mar. 31, 2017USD ($) | Dec. 31, 2017USD ($) |
Interest Costs Capitalized Adjustment | | $ 0 | $ 0 | |
Interest Coverage Ratio | | 3 | | |
Leverage Ratio | | 4.5 | | |
Line of Credit [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | United States of America, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.25% | | | |
Line of Credit [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | United States of America, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 4.00% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Base Rate [Member] | Minimum [Member] | United States of America, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.25% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Base Rate [Member] | Minimum [Member] | Canada, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 1.25% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Base Rate [Member] | Maximum [Member] | United States of America, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 3.00% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Base Rate [Member] | Maximum [Member] | Canada, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 3.00% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Canadian Dealer Offered Rate (CDOR) [Member] | Minimum [Member] | Canada, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.25% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Canadian Dealer Offered Rate (CDOR) [Member] | Maximum [Member] | Canada, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 4.00% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Bank Bill Swap Bid Rate (BBSY) [Member] | Minimum [Member] | Australia, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 2.25% | | | |
Line of Credit [Member] | Subsequent Event [Member] | Bank Bill Swap Bid Rate (BBSY) [Member] | Maximum [Member] | Australia, Dollars | | | | |
Debt Instrument, Basis Spread on Variable Rate | 4.00% | | | |
Amended Credit Facility [Member] | | | | |
Number of Lenders | | 15 | | |
Amended Credit Facility [Member] | Minimum [Member] | | | | |
Lender Commitments, Within Credit Agreement | | $ 700 | | |
Amended Credit Facility [Member] | Maximum [Member] | | | | |
Lender Commitments, Within Credit Agreement | | $ 121,700 | | |
Amended Credit Facility [Member] | US Term Loan [Member] | | | | |
Debt Instrument, Face Amount | | | | $ 350,000 |
Revolving Credit Facility [Member] | Amended Credit Facility [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | 275,000 |
Revolving Credit Facility [Member] | Amended Credit Facility [Member] | Subsequent Event [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | $ 239,500 | | | |
Line of Credit Facility, Maximum Borrowing Capacity, Increase (Decrease) | (35,500) | | | |
Revolving Credit Facility, U.S. Subsidiaries [Member] | Amended Credit Facility [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | 40,000 |
Revolving Credit Facility, U.S. Subsidiaries [Member] | Amended Credit Facility [Member] | Subsequent Event [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | 20,000 | | | |
Revolving Credit Facility, Canadian Subsidiaries [Member] | Amended Credit Facility [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | 90,000 |
Revolving Credit Facility, Canadian Subsidiaries [Member] | Amended Credit Facility [Member] | Subsequent Event [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | 159,500 | | | |
Revolving Credit Facility, The Company [Member] | Amended Credit Facility [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | 60,000 |
Revolving Credit Facility, Australian Subsidiaries [Member] | Amended Credit Facility [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | $ 85,000 |
Revolving Credit Facility, Australian Subsidiaries [Member] | Amended Credit Facility [Member] | Subsequent Event [Member] | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | $ 60,000 | | | |