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Note 4 - Credit Facilities and Other Debt (Details Textual) $ in Millions | Apr. 10, 2019 USD ($) | Jul. 03, 2018 USD ($) | Jan. 09, 2018 USD ($) | Mar. 15, 2016 MXN ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 MXN ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2019 BRL (R$) | Dec. 31, 2018 USD ($) | Oct. 05, 2018 BRL (R$) | May 29, 2018 BRL (R$) | Jan. 16, 2018 USD ($) | Oct. 31, 2017 AUD ($)
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Resource Plus, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 51.00% |  |  |  |  |  |  |  |  |  |
Resource Plus Acquisition Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |
Notes Payable, Total |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit, Total | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 180,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Payable Per Month | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Eligible Domestic Unbilled Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum Amount of Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Subsequent Event [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 18 years |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | Subsequent Event [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | Subsequent Event [Member] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Original NM Notes [Member] | Subsequent Event [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Original NM Notes [Member] | Subsequent Event [Member] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 9,500,000 |  |  |  |  |  |  |  |  |  | $ 9,000,000 |
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  | 4.99% | 4.99% | 4.99% | 4.99% |  |  |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity After Applying the Borrowing Base Formula |  |  |  |  | $ 9,500,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms, Minimum Tangible Net Worth |  | $ 13,400,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  | 5.23% | 5.23% | 5.23% | 5.23% |  |  |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
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 |  |  |  |  | 568,000 |  |  |  |  |  |  |  | $ 800,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Long-term Line of Credit, Total |  |  |  |  | 431,000 |  | $ 608,000 |  |  |  |  |  |
Revolving Credit Facility [Member] | BBVA Bancomer Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 5 | $ 258,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  |  |  | 12.50% | 12.50% | 12.50% | 12.50% |  |  |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 258,000 | $ 5 |  |  |  |  |  |  |
Revolving Credit Facility [Member] | BBVA Bancomer Bank [Member] | Interbank Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 4.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Banco Bradesco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 306,000 |  |  |  |  |  | R$ 1,200,000 |  |
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability |  |  |  |  |  |  |  |  |  |  | 0.00% |  |
Long-term Line of Credit, Total |  |  |  |  | 26,000 |  |  | R$ 100,000 |  |  |  |  |
Revolving Credit Facility [Member] | Branco Bradesco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 900,000 |  |  |  |  | R$ 3,500,000 |  |  |
Long-term Line of Credit, Total |  |  |  |  | 727,000 |  |  | 2,900,000 |  |  |  |  |
Revolving Credit Facility [Member] | Branco Santander [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 97,000 |  |  |  |  | R$ 381,000 |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 82,000 |  |  | R$ 321,000 |  |  |  |  |

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