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Note 17 - Income Taxes - Provision for Income Taxes (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Current:    
Federal $ 1,124,000 $ 1,817,000
State 128,000 316,000
Foreign 132,000 171,000
Total current 1,384,000 2,304,000
Deferred:    
Federal (592,000) 152,000
State (67,000) (61,000)
Total deferred (659,000) 90,484
Total $ 725,000 $ 2,395,452