Note 18 - Stock Based Compensation - Schedule of Nonvested Restricted Stock Awards (Details) - Restricted Stock [Member] - shares	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Nonvested (in shares)	36,220	50,600	66,500
2018 [Member]
Nonvested (in shares)	16,780
2019 [Member]
Nonvested (in shares)	16,780
2020 [Member]
Nonvested (in shares)	1,780
2021 [Member]
Nonvested (in shares)	480
2022 [Member]
Nonvested (in shares)	400