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Note 13 - Equity - Changes in Stockholders' Equity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balances $ 174,314,407 $ 129,793,269
Net income (loss) $ (361,049) (812,105)
Repurchase of common stock (in shares) (1,000,000.0)  
Repurchase of common stock $ (6,572,783) (6,529,348)
Payment of common stock tendered for employee stock-based compensation tax obligations (12,533) (13,361)
Issuance of common stock upon vesting of RSUs 0 0
Stock-based compensation 368,754 246,412
Balances $ 167,736,796 $ 122,684,867
Common Stock [Member]    
Balances (in shares) 73,543,602 77,195,704
Balances $ 7,354 $ 7,720
Net income (loss) $ 0 $ 0
Repurchase of common stock (in shares) (979,802) (957,905)
Repurchase of common stock $ (98) $ (95)
Payment of common stock tendered for employee stock-based compensation tax obligations (in shares) (1,973) (1,902)
Payment of common stock tendered for employee stock-based compensation tax obligations $ 0 $ 0
Issuance of common stock upon vesting of RSUs (in shares) 4,540 4,542
Issuance of common stock upon vesting of RSUs $ 0 $ 0
Stock-based compensation $ 0 $ 0
Balances (in shares) 72,566,367 76,240,439
Balances $ 7,256 $ 7,625
Additional Paid-in Capital [Member]    
Balances 226,070,308 224,978,430
Net income (loss) 0 0
Repurchase of common stock 0 0
Payment of common stock tendered for employee stock-based compensation tax obligations (12,533) (13,361)
Issuance of common stock upon vesting of RSUs 0 0
Stock-based compensation 368,754 246,412
Balances 226,426,529 225,211,481
Retained Earnings [Member]    
Balances (51,763,255) (95,192,881)
Net income (loss) (361,049) (812,105)
Repurchase of common stock (6,572,685) (6,529,253)
Payment of common stock tendered for employee stock-based compensation tax obligations 0 0
Issuance of common stock upon vesting of RSUs 0 0
Stock-based compensation 0 0
Balances (58,696,989) (102,534,239)
AOCI Attributable to Parent [Member]    
Balances 0 0
Net income (loss) 0 0
Repurchase of common stock 0 0
Payment of common stock tendered for employee stock-based compensation tax obligations 0 0
Issuance of common stock upon vesting of RSUs 0 0
Stock-based compensation 0 0
Balances $ 0 $ 0