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Note 4 - Investments (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Dec. 30, 2016
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Equity Method Investments     $ 0      
Cost-method Investments, Other than Temporary Impairment         $ 1,009,000
Long-term Investments [Member]            
Equity Method Investments   $ 2,145,000     2,145,000  
Investment Income (Expense) [Member] | Equity Method Investments [Member]            
Gain (Loss) on Investments, Total   $ (135,000)     $ (176,000)  
Privately-Held Identity and Professional Services Company With Ties to the FinTech Industry [Member]            
Equity Method Investment, Ownership Percentage           40.00%
Investments, Unfunded Commitments $ 1,000,000          
Investment, Unfunded Commitments, to Be Held in Escrow $ 500,000          
Lumense Inc. [Member]            
Cost-method Investments, Other than Temporary Impairment     $ 750,000 $ 250,000