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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax $ 12,406,840 $ 15,984,726 $ 24,943,229 $ 29,963,903  
Assets 35,226,695   35,226,695   $ 38,760,834
UNITED STATES          
Revenue from Contract with Customer, Including Assessed Tax 9,095,000 12,075,000 17,855,000 21,813,000  
Assets 20,839,000   20,839,000   25,354,000
Europe [Member]          
Revenue from Contract with Customer, Including Assessed Tax 1,083,000 1,275,000 2,358,000 2,637,000  
Assets 2,118,000   2,118,000   3,052,000
MEXICO          
Revenue from Contract with Customer, Including Assessed Tax 2,022,000 2,378,000 4,103,000 4,564,000  
Assets 11,490,000   11,490,000   9,476,000
UNITED KINGDOM          
Revenue from Contract with Customer, Including Assessed Tax 207,000 $ 257,000 627,000 $ 950,000  
UKRAINE          
Assets $ 780,000   $ 780,000   $ 879,000