Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Income Taxes (Details Textual)

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Note 14 - Income Taxes (Details Textual) - USD ($)
9 Months Ended
Jan. 01, 2018
Dec. 22, 2017
Sep. 30, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax, Percentage Reclassified to Income Tax Receivable       50.00%
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax       $ 1,200,000
Proceeds from Income Tax Refunds     $ 621,000  
Income Taxes Receivable, Noncurrent     621,000  
Unrecognized Tax Benefits, Ending Balance     0 $ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards, Total     130,900,000  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]        
Tax Credit Carryforward, Amount     8,700,000  
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total     $ 20,300,000