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Note 4 - Investments (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 30, 2016
Sep. 30, 2020
Mar. 31, 2020
Jun. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Equity Method Investments     $ 0        
Cost-method Investments, Other than Temporary Impairment         $ 1,009,000  
Long-term Investments [Member]              
Equity Method Investments   $ 2,053,000     2,053,000    
Equity Method Investments [Member] | Investment Income (Expense) [Member]              
Gain (Loss) on Investments, Total   $ (92,000)     $ (268,000)    
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