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Note 13 - Stockholders' Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Balance $ 139,273 $ 137,280 $ 128,764 $ 129,687 $ 139,273 $ 128,764 $ 132,425 $ 127,475
Net earnings 2,240 5,028 (675) 2,567 7,268 1,892    
Paid in capital – restricted stock units 36 123 42 47        
Issuance of restricted stock   0            
Repurchase of shares   (10) (11) (123)        
Cash dividends (283) (286) (279) (279)        
BALANCE 139,273 137,280 128,764 129,687 139,273 128,764    
Common Stock [Member]                
Balance 8,967 8,967 8,873 8,873 8,967 8,873 8,877 8,873
Net earnings 0 0 0 0        
Paid in capital – restricted stock units 0 0 0 0        
Issuance of restricted stock   90            
Repurchase of shares   0 0 0        
Cash dividends 0 0 0 0        
BALANCE 8,967 8,967 8,873 8,873 8,967 8,873    
Additional Paid-in Capital [Member]                
Balance 35,463 35,427 35,336 35,294 35,463 35,336 35,394 35,247
Net earnings 0 0 0 0        
Paid in capital – restricted stock units 36 123 42 47        
Issuance of restricted stock   (90)            
Repurchase of shares   0 0 0        
Cash dividends 0 0 0 0        
BALANCE 35,463 35,427 35,336 35,294 35,463 35,336    
Treasury Stock, Common [Member]                
Balance (13,110) (13,110) (13,063) (13,052) (13,110) (13,063) (13,100) (12,929)
Net earnings 0 0 0 0        
Paid in capital – restricted stock units 0 0 0 0        
Issuance of restricted stock   0            
Repurchase of shares   (10) (11) (123)        
Cash dividends 0 0 0 0        
BALANCE (13,110) (13,110) (13,063) (13,052) (13,110) (13,063)    
Retained Earnings [Member]                
Balance 107,953 105,996 97,618 98,572 107,953 97,618 $ 101,254 $ 96,284
Net earnings 2,240 5,028 (675) 2,567        
Paid in capital – restricted stock units 0 0 0 0        
Issuance of restricted stock   0            
Repurchase of shares   0 0 0        
Cash dividends (283) (286) (279) (279)        
BALANCE $ 107,953 $ 105,996 $ 97,618 $ 98,572 $ 107,953 $ 97,618