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Note 15 - Stockholders' Equity - Stockholders' Equity Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Balances $ 95,356   $ 94,194 $ 94,194 $ 94,194
Exercise of stock options (in shares) 16,922,000 25,316,000 41,935,000 54,359,000  
Exercise of stock options $ 29       46
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (165)       (347)
Repurchase and retirement of shares (164)       (3,281)
Stock-based compensation 847       1,648
Net income 157 $ 2,616 $ 2,991 $ 5,415 2,991
Other comprehensive income (loss) 1,314 $ 320 123 $ 930 123
Balances $ 97,374   $ 97,374   97,374
Acquisition of Cedar Holdings Group         $ 2,000
Common Stock [Member]          
Balances (in shares) 10,562,774     10,585,159 10,585,159
Balances $ 18,751     $ 16,633 $ 16,633
Exercise of stock options (in shares) 16,922       41,935
Exercise of stock options $ 120       $ 356
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (in shares) (5,836)       (18,870)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration $ 0       $ 0
Repurchase and retirement of shares (in shares) (3,500)       (70,238)
Repurchase and retirement of shares $ (6)       $ (124)
Stock-based compensation 0       0
Other comprehensive income (loss) $ 0       $ 0
Balances (in shares) 10,570,360   10,570,360   10,570,360
Balances $ 18,865   $ 18,865   $ 18,865
Acquisition of Cedar Holdings Group (in shares)         32,374
Acquisition of Cedar Holdings Group         $ 2,000
Additional Paid-in Capital [Member]          
Balances 0     880 880
Exercise of stock options (91)       (310)
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration (165)       (347)
Repurchase and retirement of shares 0       (1,280)
Stock-based compensation 847       1,648
Other comprehensive income (loss) 0       0
Balances 591   591   591
Acquisition of Cedar Holdings Group         0
Retained Earnings [Member]          
Balances 77,323     76,208 76,208
Exercise of stock options 0       0
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0       0
Repurchase and retirement of shares (158)       (1,877)
Stock-based compensation 0       0
Net income 157       2,991
Other comprehensive income (loss) 0       0
Balances 77,322   77,322   77,322
Acquisition of Cedar Holdings Group         0
AOCI Attributable to Parent [Member]          
Balances (718)     $ 473 473
Exercise of stock options 0       0
Shares deducted from exercise of stock options for payment of withholding taxes and exercise consideration 0       0
Repurchase and retirement of shares 0       0
Stock-based compensation 0       0
Other comprehensive income (loss) 1,314       123
Balances $ 596   $ 596   596
Acquisition of Cedar Holdings Group         $ 0