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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Operating Loss Carryforwards, Total $ 1,158,000 $ 2,875,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance 563,000 438,000
Accounts Receivable, Credit Loss Expense (Reversal) 330,000 83,000
Depreciation, Amortization and Accretion, Net, Total 1,700,000 1,700,000
Capitalized Computer Software, Gross 1,000,000 1,000,000
Capitalized Computer Software, Amortization 1,200,000 1,300,000
Goodwill, Impairment Loss 0 0
Share-based Payment Arrangement, Expense 136,000 235,000
Deferred Tax Assets, Valuation Allowance, Total 397,000 2,511,000
Accrued Expenses and Other Current Liabilities [Member]    
Accrual for Taxes Other than Income Taxes $ 1,300,000  
Computer Software, Intangible Asset [Member]    
Finite-Lived Intangible Asset, Useful Life (Year) 3 years  
Minimum [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Maximum [Member]    
Property, Plant and Equipment, Useful Life (Year) 7 years  
Revision of Prior Period, Error Correction, Adjustment [Member]    
Deferred Tax Assets, Operating Loss Carryforwards, Total   2,200,000
Deferred Tax Assets, Valuation Allowance, Total   $ 2,200,000