Note 4 - Credit Facilities and Other Debt (Details Textual) $ in Millions	Apr. 10, 2019 USD ($)	Jan. 09, 2018 USD ($)	Mar. 15, 2016	Jun. 30, 2019 USD ($)	Jun. 30, 2019 MXN ($)	Jun. 30, 2019 AUD ($)	Jun. 30, 2019 BRL (R$)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 05, 2018 BRL (R$)	Jul. 03, 2018 USD ($)	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
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				5.23%	5.23%	5.23%	5.23%
National Australia Bank [Member]
Debt Instrument, Interest Rate, Effective Percentage				6.56%	6.56%	6.56%	6.56%
Branco Bradesco [Member]
Debt Instrument, Interest Rate, Effective Percentage				16.56%	16.56%	16.56%	16.56%
Branco Santander [Member]
Debt Instrument, Interest Rate, Effective Percentage
Revolving Credit Facility [Member] | North Mill, LLC [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
Debt Instrument, Interest Rate, Effective Percentage				6.75%	6.75%	6.75%	6.75%
Long-term Line of Credit, Total				$ 12,200,000
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] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member]
Debt Instrument, Term	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	$ 12,500,000
Revolving Credit Facility [Member] | North Mill, LLC [Member] | NM Loan Agreement [Member] | SPAR Canada Company [Member]
Line of Credit Facility, Maximum Borrowing Capacity	2,500,000			12,500,000
Revolving Credit Facility [Member] | North Mill, LLC [Member] | Original NM Notes [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] | 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
Revolving Credit Facility [Member] | Fifth Third Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,500,000
Long-term Line of Credit, Total								$ 0
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%
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				562,000										$ 800,000
Long-term Line of Credit, Total				181,000		$ 258,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability														80.00%
Revolving Credit Facility [Member] | BBVA Bancomer Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity				261,000	$ 5
Long-term Line of Credit, Total				$ 0
Line of Credit Facility, Interest Rate at Period End				12.50%	12.50%	12.50%	12.50%
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 | R$												R$ 1,200,000
Revolving Credit Facility [Member] | Banco Bradesco [Member] | Line of Credit Facility with Banco Bradesco, One [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 312,000
Long-term Line of Credit, Total				18,000			R$ 68,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability												0.00%
Revolving Credit Facility [Member] | Branco Bradesco [Member] | Line of Credit Facility with Banco Bradesco, One [Member]
Line of Credit Facility, Maximum Borrowing Capacity				917,000
Long-term Line of Credit, Total				419,000			1.60
Revolving Credit Facility [Member] | Branco Bradesco [Member] | Line of Credit Facility with Banco Bradesco, Two [Member]
Line of Credit Facility, Maximum Borrowing Capacity | R$										R$ 3,500,000
Revolving Credit Facility [Member] | Branco Santander [Member]
Line of Credit Facility, Maximum Borrowing Capacity				99,000						R$ 381,000
Long-term Line of Credit, Total				$ 76,000			R$ 293,000