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Note 2 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Equity Method Investment, Ownership Percentage | 51.00% |
Allowance for Doubtful Accounts Receivable, Ending Balance | $ 533,000 | $ 342,000
Provision for Doubtful Accounts | 196,000 | 113,000
Depreciation, Amortization and Accretion, Net, Total | 1,500,000 | 1,500,000
Capitalized Computer Software, Gross | 1,300,000 | 1,000,000
Capitalized Computer Software, Amortization | $ 1,200,000 | $ 1,200,000
Number of Reporting Units | 2 | 2
Allocated Share-based Compensation Expense, Total | $ 221,000 | $ 225,000
Computer Software, Intangible Asset [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |
Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 7 years |

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