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Note 13 - Capital Stock (Details Textual)
 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended 18 Months Ended
Jun. 02, 2020
USD ($)
shares
May 28, 2020
$ / shares
shares
Dec. 31, 2020
shares
Sep. 30, 2020
shares
Dec. 31, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Aug. 20, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Aug. 20, 2019
USD ($)
shares
Mar. 18, 2020
shares
Aug. 13, 2019
USD ($)
Dec. 31, 2018
shares
Feb. 28, 2018
USD ($)
Proceeds from Issuance of Common Stock | $               $ 59,549,751 $ 32,204,732          
Payments of Stock Issuance Costs | $               $ 3,428,355 $ 1,023,490          
Class of Warrant or Right, Outstanding (in shares)     105,556   105,556     105,556 105,556       105,556  
Warrants for Common Class B Stock [Member]                            
Class of Warrant or Right, Outstanding (in shares)     104,772         104,772            
Warrants for Common Class A Stock [Member]                            
Class of Warrant or Right, Outstanding (in shares)     784         784            
Common Class A [Member]                            
Common Stock, Shares Authorized (in shares)     38,838,884   38,838,884     38,838,884 38,838,884          
Common Stock, Voting Rights Per Share     1         1            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)                     20,000,000      
Stock Repurchased During Period, Shares (in shares)               0            
Common Class A [Member] | Shelf Registration [Member]                            
Sale of Stock, Shelf Registration, Value, Available to Issue | $                           $ 200,000,000
Sale of Stock, Shelf Registration, Value, Incremental Amount Available to Issue | $                           $ 50,000,000
Stock Issued During Period, Shares, New Issues (in shares)     0 0 448,880 40,455                
Proceeds from Issuance of Common Stock | $         $ 9,450,789 $ 669,751                
Proceeds from Issuance of Common Stock, Net | $         9,122,227                  
Payments of Stock Issuance Costs | $         $ 328,562                  
Common Class A [Member] | Shelf Registration [Member] | Cowen and Company LLC [Member]                            
Sale of Stock, Shelf Registration, Value, Available to Issue | $                       $ 75,000,000    
Compensation, Percentage of Common Stock Sales                       3.00%   3.00%
Stock Issued During Period, Shares, New Issues (in shares)             942,223     2,141,452        
Proceeds from Issuance of Common Stock | $             $ 22,753,943     $ 49,999,625        
Proceeds from Issuance of Common Stock, Net | $             22,059,015              
Payments of Stock Issuance Costs | $             $ 694,928              
Common Class A [Member] | Underwriting Agreement [Member]                            
Stock Issued During Period, Shares, New Issues (in shares) 3,680,000                          
Proceeds from Issuance of Common Stock | $ $ 58,900,000                          
Share Offering, Number of Shares Authorized (in shares)   3,200,000                        
Share Price (in dollars per share) | $ / shares   $ 16.00                        
Stock Option, Exercisable, Remaining Contractual Term (Day)   30 days                        
Stock Option, Number of Securities Called by Each Stock Option (in shares)   480,000                        
Common Class A [Member] | Underwriting Agreement [Member] | Adam Peterson and Alex Rozek, a Board Member, and Employee [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)   39,375                        
Common Class B [Member]                            
Common Stock, Shares Authorized (in shares)     1,161,116   1,161,116     1,161,116 1,161,116          
Common Stock, Voting Rights Per Share     10         10