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Note 4 - Revolving Line of Credit (Details Textual) - Revolving Credit Facility [Member] - Texas Capital Bank, National Association [Member]
 3 Months Ended
Mar. 31, 2020
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity $ 1,500,000
Line of Credit Facility, Borrowing Base, Percent of Receivables 80.00%
Line of Credit Facility, Interest Rate at Period End 3.99%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%
Line of Credit Facility, Minimum Liquidity Threshold $ 500,000
Total Leverage Ratio, Maximum Threshold 3
Total Interest Coverage Ratio, Minimum Threshold 2.5
Total Fixed Charge Coverage Ratio, Minimum Threshold 1.25
Line of Credit Facility, Annual Draw Limit $ 250,000
Long-term Line of Credit, Total 0
Line of Credit Facility, Current Borrowing Capacity $ 198,000
London Interbank Offered Rate (LIBOR) [Member]  
Debt Instrument, Basis Spread on Variable Rate 3.00%