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 ($)
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