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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

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