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Note 15 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2016
Loss Contingency, Accrual, Current $ 500,000   $ 500,000 $ 0  
Selling, General and Administrative Expense, Total     6,656,000 $ 6,674,000  
Litigation Related to Quality of Equipment [Member]          
Insurance Deductible Accrual         $ 50,000
Selling, General and Administrative Expense, Total 0   0    
Litigation Related to Quality of Equipment [Member] | Accounts Payable and Accrued Liabilities [Member]          
Loss Contingency, Accrual, Current 450,000   450,000    
Litigation Related to Quality of Equipment [Member] | Prepaid Expenses and Other Current Assets [Member]          
Loss Contingency, Receivable, Current $ 450,000   $ 450,000    
Litigation Related to Quality of Equipment [Member] | Subsequent Event [Member]          
Litigation Settlement, Amount Awarded to Other Party   $ 500,000      
Litigation Settlement, Amount, Insurance Policy Claim   $ 450,000