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Note 14 - Impairment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Asset Impairment Charges, Total     $ 2,900,000  
Inventory Write-down   $ 1,250,000    
Accounts Receivable, Credit Loss Expense (Reversal)   66,000 $ 393,938 $ (55,320)
Goodwill, Impairment Loss $ 3,000,000 1,300,000    
Other Asset Impairment Charges   $ 280,000