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Note 13 - Variable Interest Entities ("VIE") and Transactions - Condensed Balance Sheet (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Current Assets $ 32,291,485 $ 34,959,390
Property, plant and equipment, net 4,556,581 5,311,388
Total assets 39,984,038 43,913,739
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]    
Current Assets 608,000 794,000
Property, plant and equipment, net 231,000 125,000
Other noncurrent assets 740,000 794,000
Total assets 1,579,000 1,713,000
Mortgages and other long-term debt payable 2,062,000 1,962,000
Total liabilities $ 2,062,000 $ 1,962,000