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Note 7 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
6 Months Ended 12 Months Ended 36 Months Ended
Jun. 30, 2020
Dec. 31, 2013
Jun. 30, 2020
Dec. 31, 2019
Outstanding, units (in shares) 133,747      
Outstanding, weighted average grant-date fair value (in dollars per share) $ 5.47      
Outstanding, aggregated intrinsic value $ 13,663   $ 13,663 $ 50,824
Granted, units (in shares) 19,430 25,000 92,081  
Granted, weighted average grant-date fair value (in dollars per share) $ 5.92      
Vested and settled with share issuance, units (in shares) (16,545)      
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share) $ 6.91      
Forfeited, units (in shares) 0      
Forfeited, weighted average grant-date fair value (in dollars per share) $ 0      
Outstanding, units (in shares) 136,632   136,632  
Outstanding, weighted average grant-date fair value (in dollars per share) $ 5.36   $ 5.36