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Note 7 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Salaries, wages and related items $ 5,398,877 $ 3,288,169
Profit sharing 413,522 1,769,261
Health insurance 423,680 353,825
Warranty reserves 164,240 266,455
Asset retirement obligation 562,500 562,500
Claims reserve 308,528
Taxes 508,615 353,825
Other deposits 325,000
Other 567,853 248,839
Total $ 8,672,815 $ 6,842,874