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Note 5 - Revolving Line of Credit (Details Textual) - Revolving Credit Facility [Member] - Texas Capital Bank, National Association [Member]
 12 Months Ended
Dec. 31, 2021
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 3.58%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%
Line of Credit Facility, Minimum Liquidity Threshold $ 1,500,000
Total Leverage Ratio, Maximum Threshold 3.00
Total Interest Coverage Ratio, Minimum Threshold 1.50
Line of Credit Facility, Annual Draw Limit $ 250,000
Long-term Line of Credit, Total $ 0
London Interbank Offered Rate (LIBOR) [Member]  
Debt Instrument, Basis Spread on Variable Rate 3.00%